| Patents for C01G 41 - Compounds of tungsten (1,848) |
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| 09/01/1981 | US4287159 Also containing boron, using an ion exchange resin, o-mercaptobenzoic acid, and a quaternary ammonium salt |
| 07/21/1981 | US4279870 Liquid-liquid extraction process for the recovery of tungsten from low level sources |
| 07/21/1981 | US4279869 Process for recovering concentrated, purified tungsten values from brine |
| 07/14/1981 | US4278643 Desorption with a resin copolymer of hydroxyquinoline, polyamine, resorcinol, and formaldehyde |
| 07/14/1981 | US4278642 Sulfidizing |
| 06/23/1981 | US4275039 Separation of tungsten and molybdenum by solvent extraction |
| 06/23/1981 | CA1103424A1 Chalcogenides and method of preparation |
| 05/20/1981 | EP0028648A1 Method for recovering molybdenum from tungsten solutions. |
| 03/17/1981 | US4256708 Process for recovering tungsten from cemented tungsten carbide |
| 03/10/1981 | US4255396 Extracting with di-2-ethylhexyl phosphoric acid with dinonylnaphthalene sulfonic acid as a modifier |
| 02/24/1981 | CA1096328A1 Plasma method of producing selective particle sized oxide, product produced thereby and apparatus therefor |
| 12/23/1980 | US4241028 Sorption of tungsten from alkaline solutions |
| 11/27/1980 | WO1980002554A1 Method for recovering molybdenum from tungsten solutions |
| 11/11/1980 | US4233254 Thermosetting resin binder |
| 09/09/1980 | US4221828 Process of producing metal sulfide powder coated with copper |
| 07/01/1980 | CA1080440A1 Process for the manufacture of ammonium tungstate from tungstates of alkaline earth metals |
| 05/28/1980 | EP0011475A1 Recovery of tungsten values from tungsten-bearing materials |
| 04/29/1980 | CA1076341A1 Dielectric powder compositions |
| 04/08/1980 | US4197161 Process for the recovery of catalysts in the epoxidation and hydroxylation of olefinic compounds |
| 12/25/1979 | US4180628 Resin for sorption of tungsten |
| 12/18/1979 | CA1068072A1 Process for the manufacture of ammonium tungstate from reduced alkaline earth metal tungstates |
| 12/18/1979 | CA1068071A1 Process for the manufacture of ammonium and alkali metal tungstates |
| 12/18/1979 | CA1068070A1 Treatment of tri(alkaline earth metal) tungstates with acids |
| 12/12/1979 | EP0005877A2 Process for decomposing hard metal scrap |
| 11/27/1979 | CA1067061A1 Recovery of catalysts in a fluidized bed |
| 11/20/1979 | US4175109 Process for extracting tungsten from alkali metal tungstate solutions |
| 09/18/1979 | US4168296 Extracting tungsten from ores and concentrates |
| 09/11/1979 | US4167555 Extraction of tungsten from ores |
| 05/15/1979 | CA1054519A1 Application of a compound of heteropolyanions containing tungsten combined with antimony as an antiviral agent |
| 09/26/1978 | CA1039028A1 Production of freeze-dried metal salts |
| 09/19/1978 | US4115513 Slurrying in hydrochloric acid, ion exchanging, stripping |
| 06/20/1978 | US4096087 Electrochromic and photochromic material and a method of fabrication of said material |
| 05/30/1978 | US4092400 Caustic leaching, filtration, chemical treatment, acidification |
| 04/11/1978 | US4083922 Process for the manufacture of ammonium and alkali metal tungstates |
| 04/11/1978 | US4083920 Recovering tungsten values, hydrochloric and nitric acid |
| 03/21/1978 | US4080421 Process for preparing ammonium tungstates |
| 03/21/1978 | US4080420 Calcining, reacting with ammonium, sodium, or potassium carbonates, bicarbonates, hydroxides, or phosphates |
| 09/13/1977 | US4048546 Dielectric powder compositions |
| 12/14/1976 | US3997331 Ammonium paratungstate |
| 11/30/1976 | US3995011 Preparation of tungsten hexafluoride from halogen and hydrogen fluoride |
| 11/16/1976 | US3992159 Process for purification by cryogenic sublimation |
| 07/13/1976 | US3969484 Process for recovering tungsten from alkaline leaching solution of tungsten ores |
| 07/13/1976 | US3969478 Process for separation of tungsten and molybdenum by extraction |
| 07/13/1976 | US3969123 Tungsten and tantalum oxide |
| 05/11/1976 | US3956474 Process for producing ammonium metatungstate from ammonium tungstate by digestion in silica |
| 03/30/1976 | US3947332 Preparation of heteropoly acids of tungsten and molybdenum |
| 02/17/1976 | US3939245 Sulfuric acid, hydrogen sulfide, recycle |
| 02/03/1976 | US3936362 Process for the manufacture of ammonium tungstate ammonium paratungstate, ammonium metatungstate and hydrated tungsten trioxide |